No "Undo" History: You cannot redo something unless you have performed an "Undo" first (unless you are using the Repeat function).
Action Limits: Some programs only remember a certain number of steps. If you've moved too far back or forward in your history, the redo command may be grayed out. shortcut key for redo in windows
This shift occurred because it feels more intuitive to many users—since Ctrl + Z is undo, adding the Shift key simply reverses the direction of that logic. If Ctrl + Y doesn't work in your specific software, try this three-key combination. Redo vs. Repeat: Understanding the Difference No "Undo" History: You cannot redo something unless